Numerical Simulation Of The Flow Characteristics Of The Pneumatic Conveying Systems Inlet Structure

Pneumatic conveying is one way to transport granular particles in the pipe with air power. It has developed rapidly due to small footprint, flexible layout and closed well. It has a widely application in many industries.But the technical problems of this transport system are large energy consumption and limit distance. For the purpose of reduction energy consumption and improve distance, we designed a new inlet structure by the idea of sands into pipe by negative pressure and moving by positive pressure, combining with pressure feed type and suction type pneumatic conveying, then verify the design’s feasibility and study the flow situation of accelerating area. The main work is as follows.1) The simulation of2-D designed inlet structure has done. After building two different of inlet structure of bend pipe models, we in turn did the simulation of only aerodynamic flow, linear inlet velocity flow and nonlinear inlet velocity flow, the we get:the design meets that under the effect of0.5MPa air power, sands can be sucked into pipe and air power inlet depth into pipe at a distance is more beneficial to suction; sands move by the type of group stream, and the period of air power inlet depth into pipe is relatively short; the sand velocity increases with the height, namely after into the pipe, sand moves by positive pressure; either linear or nonlinear speed model, the numerical of steady velocity is decided by air power. Simulate the inlet structure of straight pipe model and prepared with bend pipe model, we know that group steam is caused by bending and straight pipe is more beneficial to suck sand than bend models.2) The simulation of2-D designed inlet structure has done. The3-D inlet structure used cooper way to mesh. Simulation of3-D inlet structure is closer to the actual project for verifying the viability of the designed inlet structure.